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Her sister rushed over to her home along with Taylia and Brogan's stonemason father, Joff Warren, 49.

Byrne, who separated from Warren 16 years ago, broke the news to her ex-partner in the kitchen of her home.

She said: "He was devastated, couldn't believe what I was telling him.

"We were desperately trying to get hold of the Northamptonshire Police to get official confirmation of what had happened.

"But because the crash had happened in Oxfordshire, 45 miles [70km] away, Brogan's name wasn't coming up on our local police's system."

Finally, at 1pm on May 23, an officer from Thames Valley Police - the force that covers Oxfordshire - confirmed Brogan had died in a head-on crash on the A40 Shrivenham bypass in Oxfordshire at 11.15pm.

Sadly, her friends, Sam Jones, 23, Nicoletta Tocco, 25, and Sam Kay, 26, had also died in the smash involving the Citroen Saxo driven by Jones, and a Mercedes being driven by a man from Swindon, Wiltshire.

He was in hospital, with his wife and 3-year-old child.

Brogan and her friends had been travelling back from a vegan festival in Bristol, called VegFest, when they crashed.

Byrne continued: "At 8pm on the Sunday [the night of the crash] Brogan texted me and said they'd be driving back soon so, with Tianna staying with my sister, I took advantage and had an early night.

Brogan was in a car with her friends as they travelled back from a festival in Bristol. Photo / Facebook

Brogan was in a car with her friends as they travelled back from a festival in Bristol. Photo / Facebook

Their vehicle, driven by Jones, overturned after ploughing into the other car and suffered "catastrophic damage", the court was told.

Toxicology reports found Jones had cannabis and alcohol in his bloodstream, although he was below the drink-drive limit.

Oxfordshire coroner Darren Salter said it wasn't possible to exactly what happened.

"But it does seem likely that either driver fatigue or driver distraction seemed most likely potential causes.

"Fatigue, perhaps nodding off at the wheel, is a possibility or some kind of distraction either inside or outside the vehicle."

PC James Henderson, who prepared a report on the crash, said: "It is not known why the driver of the Citroen came to be on the wrong side of the road.

"There are a number of potential causes but there is insufficient evidence available to be able to categorically state which is contributory."

He added that he did not believe either Jones or the other driver were speeding prior to the collision.

Patrick Maguire, of law firm Slater and Gordon who represented Brogan's family, said: "Brogan's death at such a young age has devastated her family and those around her and they are still struggling to come to terms with their loss."